Simple Square Wave Oscillator



Notes:
Using two gates from a CMOS 4011 NAND chip, a simple square wave oscillator can be made. Alternatively a CMOS 4001 chip can also be used, or a TTL equivalent. In this circuit the mark space ratio can also be independently controlled by varying the value of the resistors. The rise and fall times of the output pulses depend on the operating voltage of the IC and type of IC, but will be typically in
the order on tens of nanoseconds.



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